Totalizing key punch



March 16, 1954 H; P. LUHN TOTALIZING KEY PUNCH Filed De c. 31

4 Sheets-Sheet 2 INVENTOR HANS P. LU HN FIG.50

ATTORNEY March 16, 1954 H. P. LUHN TOTALIZING KEY PUNCH 4 Sheets-Sheet 5 Filed Dec. 31

ADD

KEY BOARD COMMON COL.5

COL.4

INVENTQR HANS P, LUHN RIE "Rid

ATTORNEY March 16, 1954 H. P. LUHN TOTALIZING KEY PUNCH 4 Sheets-Sheet 4 Filed Dec. 31, 1951 FIG. 7

FIG.6

90 I35 TR INVENTOR HANS P LUHN ATTORNEY Patented Mar. 16, 1954 TOTALIZING KEY PUNCH Hans P. Luhn, Armonk, N. Y., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application December 31, 1951, Serial No. 264,328

8 Claims.

The present invention relates to a machine for producing th algebraic summation of two or more factors.

The principal object of the invention is to provide an electrical adding machine in which addition is performed by metering pulses to impulse accumulators as prescribed by amounts entered serially into code storage relays.

Another object of the invention is to provide an electrical adding machine in which a stepping switch controls the serial entry of a value into a storage unit and then efiects parallel readout of the storage unit into impulse type counters.

A further object of the invention is to provide a device in which amounts are entered serially into storage relays on the basis of a self-complementary four element code and are added by metering out pulses as determined by the relay storage to impulse counters.

The instant invention is directed to an adding machine in which the amount to be added is entered serially under the control of a stepping switch into storage relays on the basis of a selfcomplementary four element code. Each digit of the amount is set up in combinational form on contacts controlled by the corresponding storage relays. The relay storage contacts are so arranged in conjunction with the contacts of the stepping switch so as to meter out pulses to the pertinent impulse counter pursuant to the amount entered in the storage relays.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of examples, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

. Fig. 1 is a view of the essential parts of a record card punchingmachine.

Fi 2 is a record card.

' Fig. 3 is a detail of the interposer bail con tacts and operating mechanism.

Fig. 4 is a detail of the escapement contacts and operating mechanism.

Figs. 5a and 5b placed side by side in the order named constitute a wiring diagram of the circuits of the device.

Fig. 6 is a timing diagram of the cam controlled contacts shown in the wiring diagram.

Fig. 7 is a View showing the stepping switch mechanism.

Card handling mechanism The record card 30 (Fig. '2) is provided with co1- umns of index point positions designated 0 to 9 in which digits are recorded by perforations made in appropriate positions. These columns are grouped into fields such as fields A, B and C and multidenominational amounts are recorded in such fields. In Fig. 2 the card is shown as having the amounts 86,176 and 59,114 punched in fields A and B respectively, and the algebraic summation of these amounts, 27,062, in field C. The blank card 39 is placed in the carriage of a well known type of punching machine which comprises a horizontally reciprocable rack 64 (Fig. 1) supporting a pusher and a forward guide 56 between which the card 30 is held and moved step by step or column by column toward the left to bring each column in turn into line with a transverse row of punches 61. The rack 64 is geared to a spring drum 68 which normally urges the rack toward the left and an escapement device comprising stepping pawl 69 and holding pawl 10 control the racks advance. When rod 1! (Fig. 4) is rocked counterclockwise, pawl ill lowers into a rack tooth and pawl 69 is raised up and due to a loose fit on rod H the nose of pawl t9 moves slightly to the right under the influence of its spring so that when rod H is rocked back again pawl 10 is lifted up and pawl 69 engages the next rack tooth to space the rack one tooth or card column.

Magnet l2, of which there is one for each of the ten punching positions, will, when energized, rock lever 13, to depress key 14, which through bell crank 15 slides an interposer 16 to the left. Movement of interposer 16 will rock a plate '11 which through a hooked link 18 (Fig. 3) closes interposer contacts 19 to complete a circuit for punch magnet (Fig. 1).

When magnet 80 is energized it attracts its armature 32 (Fig. 1) and through linkage 33 rocks bail 34 to force the left end of the advanced interposer 16 down against the related punch 61 and at the same time, interposer l'a rocks bail 35 on rod 1! to engage pawl H1 in a rack tooth. Rocking of bail 34 (Fig. 3) disengages link 18 from plate 11 so that contacts 59 reopen, deenergizing magnet 80 and allowing th parts to return to their initial positions and causing the carriage to advance one step.

This briefly is the operation of the punching mechanism, and where columns are to be skipped, the well known space key (not shown) is actuated to step the carriage without punching. The usual escapement contacts 39 (Fig. 4) are also provided and these are diagrammatically represented as controlled by pawl 69 so that they open during the carriage escapement and reclose when the carriage has completed its step of advance.

Referring now to Fig. 5a, there is provided, for the purposes of this invention, a set of digit representing, key actuated contacts designated 40. When any of these contacts is closed, it completes a circuit fromline M coupled to the positive terminal of a :source of potential '(not shown), contacts 49, punch selector magnet 12 to line 8|, which is coupled to the grounded or negative terminal of the source of potential, to cause punching of the related digit in the card column at the punching station. At the same time, as shall be described in more detail subsequently,

a parallel circuit will be set up ior temporarily storing the entered value.

Stepping switch The stepping switch (Fig. 7) employed in the present invention is of the type having a multiple number of levels or columns of contacts with there being twenty steps or contacts "positions for each column. This stepping switch is similar in construction to that switch shown in Fig. .83 of the applicants copending patent application Serial No. 163,250 filed May 20, 1950, now Patent No. 2,615,626, with the exception that the switch,

shown here in Fig. 7 is magnetically driven. As described in the copending application, the advancement of the contactor for eachcolumn from step to step is caused by mechanical means under electromagnet control.

The stepping switch mechanism is illustrated in Figure 7 only sufficiently to enable the general operation of the mechanism to be understood, and reference should be made for a more .complete description to the above mentioned copending application.

The stepping switch control and operating mechanism are containedbetween {two plates (not i 1 shown) which are held in spaced relationships by the studs 94, 95, 9.6 and 91.

A magnet 83 is mounted between the supporting plates in an obvious manner. The armature M which is pivotably supported about the stud 1112 has fixed thereto an arm 53 which through the spring I08 normally biases the armature away from the core of the magnet 83. The free end of the arm 98 pivotably supports a ratchet pawl I 05. The pawl I 05 is capable or engaging the teeth of a ratchet H16 fastened to :a hollow shaaft rotatably mounted on stud 91.

When the magnet 83 is energized'the armature I" will be attracted thereto causing the arm -98 to move in a clockwise direction about the pivot H2 against the bias of the spring I08. movement of the arm 98 will displace the tooth of pawl Hi5 a distance slightly more than the size of one tooth of the ratchet L06. The ratchet wheel 106 is prevented from iollowing :the move ment of the pawl 05 ?by .a .dent 1.08 which is coupled to pawl 105 by the spring -99, and is pivotably carried at till by the supporting "plate. In order to preventrotation of the ratchet *w-heel 1% beyond the amount imparted by the :movement Of the arm 98., the pawl 185 has beenproviided with an extension H which because of its relative movement will be brought into engagement with a tooth remote from that engaged by the other arm of the pawl Hi5.

When the magnet -83 becomes deenergized, the arm 98 will be restored to its normal position by the spring lfiB causin as a result, the pawl Hi to step the ratchet 105 one position.

vAssociated with the hollow shaft 4'02 there are a plurality of wiper arms 48, 49, 50, 5E and 58 (only arms 48 are shown in Fig. '7), arranged in pairs, with each pair being interconnected electrically. The arms 48, I9, 50, 5| and 58 are insulated with respect to each other and with respect to the rest of the switching mechanism by mounting them on a dielectric sleeve and interspacing them with dielectric rings :(notpshown). All the wiper or contact arms rotate as one with hollow shaft I01 and ratchet wheel I06.

There is associated with each pair of wiper arms .a commutator plate ll'l consisting of a dielectric sheet onto both sides of which there are secured contacting elements H8. Each pair of wiper arms is arranged such that their ends may contact either sides of the corresponding commutator plate 411.. .A common circuit element H9 which also is mounted on each side of the plate 11*! will be successively connected to the individual contact elements H8 as the associated wiper arms are stopped to each element d :13. Each of contact elements 12w are connected to aiming units I20 in order to establish commotion external circuits while the plugging units :III are used to establish electric connections to the electromagnet 83.

As shown in .Figs. and 5b,. the respective wiper or contactors 18,41}, .56, 5.4 and 58 *for columns 1 to 5,,inciusive, eu'ein humepnsition "when engaging the first step contacts 116.. The .contactors are advanced to the :No. 2 contacts when the :contacts 82 flilg. 5b) are aimed, thereby enabling the cam controlled contacts to apply an impulse to the stepping advancemagnet Bifor energ 'mingsaidmagmt. The

circuit for energizing the magnet 88 is traceable as follows: line M, contacts :CBI :no'w cioscd, contacts 82 now closed, normally closed contacts Rl2c, contactor 58 in the N0. 1 step position, line e4, contacts Rita and Rim as shown. magn 83 and then to ground. Upon the termination of the CB1 impulse, the magnet .83 will be returned to its deenergized state causing the eomtactors to shift to "the No. 2 step :in a manner as explained in the aforementioned copending application. The timing for the cam controlled contacts GB?! is shown in Fig. 6 while the operation of "these ccntactswill be described more rullysuboeqnenrtly.

For the purpose of this application, the contacts :82 are assumed to :be manually closed whenever a series of values is'to be enter-edict theater age relays. It is obvious that contacts 82 could be closed by a program device, such as, for meample, the program card described in Gardiner et a1. patent application Serial No. 1 2 .filed July :6, i949, now Patent .No, 2,647,581.

The next six steps, steps 2 to 85,, inclusive, for columns 1,, :2, :3 and 4 are coupled to latch type relays which conecnvelv term a relay storage unit. The relays coupled to the contacts 2 to .6 in column 1 each equivalent :to a s value; the relays coupled to the corresponding contacts in columns :2 and 3 are each respectively representative of a 2 value; while therelaysacounledtc the corresponding contacts-n1 column 4 areeach representative of a 1 value.

The value to be entered in the storage relays is entered :by depressing the appropriate one of the keys shown in Fig. 5c. The entered value is converted to the 4, 2, :2, 1 code and stored in the relay storage unit. The values are entercrlrintm relay storage unit such that the first value will be entered through the energization of the latch rel ys BAA, 122A, BIG and RM. in combination to the add magnet 85 as while. assuming five values, the last valuewill be combinationally entered in the latch relays R4E, R2E, RZK and RI E.

The fifth column contacts (Fig. b) for steps 2 to 6, inclusive, have associated therewith the respective contacts 52, 53, 54, 55 and 55. These contacts are manually controlled for the purpose of this application but, like contacts 82, they could just as well be controlled by a program device. When the contacts 52 to 56 are in the position shown in Fig. 5b the energization of the stepping magnet 83 is under the control of the keyboard. But by transferring any of these contacts a CBI impulse will be applied direct to the magnet 83 causing the contactors to step to the next position following the transferred contacts.

The setting of these fifth column contacts determines the size of the field to be entered in the relay storage units. For example, if the size of the field to be stored comprised only two digits, the operator would initially transfer the contacts 52, 53 and 54. With contacts 52, 53 and 54 shifted, then the closing of contacts 82 would enable three successive CBI pulses to be applied to the advance magnet 83 resulting in the contactors being positioned in step No. 5 position. The first digit of the two digit field will then be entered in the storage relays associated with step No. 5 positions of the columns 1, 2, 3 and 4.

Step No. 7 for columns 2 and 3 are respectively coupled to the add relay R12 and the subtract relay RI3. These relays will become energized when either the add key contacts 653 or the subtract key contacts 53 (Fig. 5b) are closed when the contactors 49 and 50 are in step No. 7 position.

The energization of relay R]?! will close the contacts RlZb (Fig. 5b) which, in turn, will unblock the CB2 impulses causing the contactors to be successively stepped through positions 8 to 20 and the relay storage to be read out for each step. The contacts CBI and CB2 are controlled by continually running cams in a well known manner. The contacts CB2 are inefiective until the relay R12 is energized at which time, due to the opening of contacts R120 (Fig. 5b), the CBI impulses are made ineifective.

Referring now to column 1 (Fig. So), it is to be noted that the first factor which will be entered in relays R4A, RZA, R2G and RIA will be combinationally set up in the contacts R ta, R211, R2g and Rla. These contacts when in the position shown in Fig. 5a will enable, as shall be described subsequently, the complement of the value entered in the storage relays to be read out by CB2 impulses. When any of these contacts are in a transferred position, a circuit will be completed for successively applying CB2 impulses the contactor is stepped from positions 8-16. Depending upon, the condition of these contacts, it is to be noted as the contactor 4c is successively stepped from step No. 8 to 11, that a circuit will be completed through contacts R4a to the add magnet 85 causing the counter to be advanced four units; that when the contactor is stepped through positions 12 and 13, a circuit will be established through contacts RM to the add magnet 85 causing the counter to be advanced two units; thatwvhen the contactor is stepped to positions Nos. 14 and 15, a circuit will be completed through the contacts R2g for advancing the counter two units; and that when the circuit will be completed through contacts Ric for advancing the counter one unit.

contactor is in position No. 16, a'

line 4|,

The counter, of which the add magnet 85 is a component part, is of the type shown and described in Patent No. 1,875,850, issued September 6, 1932 to Fred M. Carroll. A described in this patent, each time the add magnet 85 receives an impulse a ratchet wheel will be stepped one unit. For a more complete description of this counter, reference should be made to the aforementioned Carroll patent.

When the contactor 48 is in step N0. 1'7 position, a carry operation will take place while when it successively assumes positions Nos. 18 and 19, the various carry contacts and latched relay contacts will be tripped while the contactor will be returned to its home position. These operations will be described subsequently in more detail with relation to a specific problem. When the contactor 58 of column 5 is advanced to position No. 20, the stepping switch will be moved to the No. 1 position.

Problem It is believed that the applicants device can be best described in reference to a specific problem wherein it will be assumed that the contacts 52 to 55 (Fig. 5b) are in the position shown. Taking the problem of Fig. 2 and assuming that contactors 48, 49, 50, 5| and 58 are in step No. 2 position, the record card is placed in position with its column 1 in line with the row of punches. Accordingly, with column 1 now in position, the operator now depresses the 8 key (Fig. 50) to close the 8 contacts 40 and the eifect of this to set up a pair of parallel circuits. The first circuit which is obvious will cause the energization of the 8 punch selecting magnet 12 which, in turn, will enable the punch magnet to be energized thereby causing an 8 hole to be punched in column 1 of the card. The second circuit which is established will cause the keyed value to be stored in the appropriate relay storage positions. This circuit may be traced as follows: conductor 4| which is connected to the positive terminal of a potential source (not shown), the 8 contacts 45 now closed, conductor 42, the rectifiers 43, the respective lines 45, 45 and 41, the corresponding contactors 55, 49 and 48 in step No. 2 position, the corresponding relays RZG, RZA and RGA, and then to ground. With the energization of the storage relays the corresponding contacts R4a, R2a, R29 Will be shifted and latched in this position. These contacts will be latched until the contactors are stepped to step No. 19 at which time they will be unlatched through the energization of the relay R18 (Fig. 5b).

When the operator depresses the 8 key, and with the CBI contacts in a closed position, a circuit will also be established for energizing the stepping switch advance magnet 33 causing the contactors to shift to step No. 3 contacts position. This circuit may be traced as follows: cam controlled contacts CBI now closed, contacts 82 now closed, normally closed contacts RIZc, contactor 58 in step No. 2 position, contacts 52 as shown, the relay R15 and then to ground. When the relay R15 is energized the associated contacts Rl5a are transferred enabling an obvious circuit to be established through the now closed keyboard common contacts 86 for energizing the advance magnet 83. It is to be noted that the keyboard common contacts 86 are closedeach time any of the;key contacts 40 are closed inthe usual and well known manner.

Ito move to step energizing of these storage relays will result in s in the 8 contacts position ama of RAB and R213 will shift the contacts Rib and Bib.

After the thousands digit of the factor 86,1376 .hasbeen entered in the keyboard storage relays the operator will depress a key to close the 1 contents 411. This operation will result in the cmfresponding selector magnet 12 the r sin-age relay .RxtC being energized, as well as naming the acontactor to shift .to step No. 5cm!- iacts The operator will thencause the tens digit to be stored in the keyboard storage relays RAD, RZD and RID by depressing a key to close the 7 contacts 40. The depressing of the key at this time willenergize the associated punch selector magnet and cause the contactors No. 6 contacts posit'mn. The

the corresponding contacts RAd, Rid and Bid being transferred and latched in that position. Similarly, the units digit of the factor 86,176 will be entered in the relays RAE and R213, the associated contacts .RAE and RZE will be trans Ierred, and the contactors will he stepped to step No. .7 position.

While the contacts of the .rotator control column No. 5 are shown as being manually settable, it is well to ,point out that it wholly within the scope of the invention that these contacts be under the control of some programming device such as, 01 example, the program card disdosedin-the patent application of Gardiner et a1". Serial No. 103,224, filed .July 5,, 1949.. It also to he realized that if the accumulate field .con tained only two digits, the switches 52, 53 and 54 would he set to cause direct energization of the advance mag-net v8i prior to the entering of two digits into the storage relays.

Thus, at this stage, the factor 86,176 is stored in the storage relays such that the digit 8 is now stored .in the keyboard storage relays BM, 82A and vRZG, the digit 6 .in relays R413 and 3.23, the digit 1 in the relay R10, and the digit 7 in the relays RlD, RID R111, and the digit 6 in relays R lEand RZE.

since the amount entered .in the storage relays is to be added, the add .key will now :be depressed olosmg the contacts 6.0 (Fig. 51):).

The contacts when closed will enable an obvious circuit to he established through column No. v2 contactor 49 to energize the latch type eddrelayR-IZ (Fig. 5a).. energization of the add relayRll willclose the contacts R1217 .(Elg. 5b.), transfer the contacts Rifle \(Flg. 5b md open the contacts Bile causing these conducts ito latched in their respective positions. bvith the contacts R'LZLL now in a transferred position, a circuit will be established for applying a series of impulses by the cam controlled con-- tacts CB2 to the stepping switch magnet 183 in order to step the 'contactors through the remaining steps -7 to 20 inclusive. The circuit establashed lflOI applying the pulses to the stepping switch advance magnet :83 is traceable as follows: line 1U, cam controlled contacts CB2 now closed, contacts 312a advance magnet :83 and then to ground. Upon the termination of the CB2 pulse the advance 83 deenergiaed at which time the oontactors will be shifted to the 8 contacts position. The same operation will take place for the "next twelveflmpulses causing the contactors to .be =successively stepped through the remaining contacts posh tions. The opening of contacts Rizc will render the CBI impulses ineffective placing further stepping of the respective contactors under the control of the C132 impulses as :just explained.

When the contactor assumes contacts polition '8 the storage relays will be read out. For example, with the column No. l contactor 48 in contacts position 8,, the storage relays containing the highest order digit will he read out as follows: line M, CB2 contacts now closed, contacts Rilb now closed, Rl ib as shown, conductor 81 (Fig. 5b to 5a.), contacts Rlc transferred, :contaotor 48 in the 8 contacts position, the add magnet 85 of column .No. 1 and then to ground. The feeding of this pulse to the add magnet will cause it to he stepped to the 1 position thereby registering this impulse. When the contactor is successively moved to contacts 8, HI and -H, a CB2 impulse will be applied through the contacts Rla in-a similar manner to the :add magnet 85. Similarly successive pulses will be applied to the add mag-net under control of contacts R2a as will be the .case with respect .to the contacts R2 g.

With reference to column No. 1,, when the contactor 48 is in the 15 contacts position, .a series of eight pulses will .have been registered in the add magnet with four pulses being applied through contacts Rm, two pulses through 3.2a,

= and two pulses through contacts Rm. When the contactor is shifted to the 16 contacts position an open circuit condition will exist due to the fact that the contacts Rla have not been transferred. In each case, however, the C132 pulse will the applied to the stepping switch advance magnet 83 such that in the 17 contacts position a carry operation will take place if such is called for at this time. It is to be realized that concurrently with the reading out of the highest order that the remaining orders :or columns will likewise be read out.

As is well known and described in the C. D. Lake Patent No. 2,480,744 issued August 30, 1-949, when the respective counters pass through the :n'ines and tens positions, contacts 6| and B2 iEigs. 5a and 1517:) close so that a carry operation will take -place when the respective contactors 48., M, 5!], 5.1 and 58 are switched to step .No. 17 contacts position. inasmuch as in the problem assumed :a carry operation does not take place at this time, the description of the carry circuit will be deferred after the second factor has been entered.

As previously descrl with the respective contactors in contacts position .17, a CB2 impulse will be applied through contacts R directly to the advance magnet 83 causing the contactors to he stepped toposition 1-8. With the contactsm position .18 a CB2 impulse will be applied directly :to the carry trip coil Ri -l (Fig. 5b.) to reset all of the tens contacts 62 in a manner similar to that shown in the aforementioned Lake patent. The relay RM collectively represents five cam trip coils each of which is operably associated with the corresponding impulse counter for each column to cause the unlatching of the respective tens contacts .62. 7

After the contactors been to-the next contacts position a CB2 impulse will be applied directly to the rehy Bi 8 :51?)

upon being energized, will clear all of the adding controls by unlatching the various latched elements. With the contactor 53 now stepped to contacts position No. 20, a circuit will be established for applying a CB2 impulse to the magnet 83 in order to home the contactors to the No. 1 position. This circuit is necessary inasmuch as the contacts Rl2a have been restored to the position shown. Thus, after the various contactors have been returned to their original home position there will have been entered in the counters the factor 86,176. For the purpose or simplicity the relay Rl8 collectively reprecents a tripping coil operably associated with each of the storage relays, the add relay BIZ and the subtract relay Rl3. It is to be understood that when the fifth column contactor 52 is stepped to step No. 19, the trip coil associated with each of the latched relays will be energized causing the corresponding contacts to be restored to a normal position in a well known manner.

The next factor to be entered is 59,114 as shown in field B of the record card (Fig. 2) which is to be subtracted from the amount standing in the counter. This second factor will be entered and stored in the appropriate storage relays in a manner similar to that described for entering the factor 86,176. Subtracting operations are performed by the say, a digit is entered in each counter which is the nines complement of the digit entered in the storage relays. Thus, it is believed suflicient to state after entering the amount 59,114 in the storage positions and with the contactors now in step No. 7 position, that in the first column the storage relays RZA, RZG and RIA will be energized, in the second column storage relays R413, R-ZB, R251 and RIB will be energized, in the third column storage relay RIC will be energized, in the fourth column storage relay RID will be energized, and in the fifth column storage relay R4E will be energized.

Now, since the second factor is to be subtracted from the first factor, the operator will depress the subtract key closing the contacts 63 (Fig. 5b) which will establish an obvious circuit for energizing the relay Rl3. The contacts Rl3a which will be latched when the corresponding relay is energized will, in turn, cause the relay R12 to be energized The relay Rl2 will transfer the contacts RI 2a enabling a circuit to be established for applying a CB2 impulse to the advance magnet 83 thereby-causing the contactors to be stepped to position 8. As previously described, a CB2 impulse will successively step the respective contactors to positions 9 to 20, while concurrently causing the storage relays to be read out for each step.

With the relay R|3 energized, the counter units will now be impulsed in accordance with the complement of the number that had been entered in the relay storage positions. As an example, this operation may be described with particular reference being made to the readout arrangement of the column No. 1. It is to be recalled that the contacts 112a, R29 and Bid are all shifted because the associated relays have been energized.

Now when the contacts Rlzb (Fig. 5b) are latched and Rl3b are transferred and with contactor 48 in step 8 position, a CB2 impulse will be applied to the add magnet 85 of column No. 1 causing this counter to be stepped to add a count of 1 to the previously entered count of 8 standing in the counter. The circuit enabling this complemental process, that is to operation to take place may be traced from the now closed CB2 contacts as follows: contacts Rl2b now closed, R1317 transferred, line 88, contacts R4a as shown, contactor is in the 8 step position, the add magnet. and then to ground. For each of the contacts positions 8 to 11 which are successively coupled to the contacts R ta, a pulse will be applied to the add magnet 35 causing this counter, which originally had an 8 entered therein, to pass through zero to close the corresponding tens contacts 52 and to finally register a count of 2. Inasmuch as the remaining relay contacts Rid, R2g and RM are all transierred, no further pulses will be applied to the add magnet 85 in column No. 1 when the contactor 43 is stepped through steps 13 to 17 inelusive.

The remaining columns 2, 3, 4 and 5 will be read out in a similar fashion. Thus, with the respective contactors now in step N o. 16 position, the corresponding counters for columns 1, 2, 3, 4 and 5 will have entered therein the values 2, 6, 9, 5 and 1 with the tens contacts 62 for columns 1, 4 and 5 being closed while the nines contacts 5| for the column 3 will be closed.

With the contactors now being stepped to contacts position 17, a carry operation will take place in which the fugitive one will be entered in the add magnet of column 5 while the corresponding counters of columns 2, 3 and 4 will be moved one additional unit.

The circuit established for entering the fugitive one in the counter of column 5 is traceable as follows: CB2 contacts now closed, contacts RlZb now closed, line 89, tens contacts 62 for column No. 1, line 96, contactor 58 in step No. 17 position, add magnet 85 of column No. 5 and then to ground. Thus, this counter will now be stepped one unit to register the value 2.

The circuit established for advancing the column 4 counter during this carry operation is traceable as follows: CB2 contacts now closed, contacts R|2b now closed, line 89, tens contacts 62 of column No. 5, contactor 51 of column No. 4

in step No. 17 position, the corresponding add magnet 85 and then to ground. The completion of this circuit will step the column No. 4 counter from a 5 to a 6 position.

The circuit established for advancing the columns 2 and 3 counters during the carry operation may be traced as follows: CB2 contacts now closed, contacts RlZb now closed, line 89, tens contacts 62 of column No. 4, now closed, a parallel circuit consisting of contactor 55 of column No. 3 in the step No. 17 position, corresponding add magnet, and the now closed nines contacts 6| of column No. 3, contactor 49 of column No. 2, corresponding add magnet, and then to ground. This CB2 impulse which is applied to the respective add magnets of columns 2 and 3 will cause each of the associated counters to be stepped one additional unit to respectively register the values 7 and 0.

Thus, after the contacts are stepped to step No. 18, the respective counters for the columns 1, 2, 3, 4 and 5 will register the sum of the two factors which will be 27,062.

The remaining operations associated with the contactors being stepped to contacts positions Nos. 18, 19 and 20 have been described and will not be repeated here.

While it is not shown it is obvious in order to secure representation of the digits of a sum standing in each counter that a total readout airbase vby closing the reset control contacts 9| (Fig. b).

The closing of contacts B l will enablea series of CB2 impulses to be appliedto the respective reset coil 93 of each coil through the corresponding reset contacts 32. The resetcontacts 92 are normally closed when the counter is registering any p value from l to 9, and open when the counter registers 0. Thus, for example, in order to reset the column No. 2 counter which has a 7 entered therein, a series of three CBZ impulses will be applied through the corresponding reset contacts to the reset coil of column No. 2 to step this counter to zero. When the counter registerszero, :the reset contacts 92 will open thereby preventin'g 'further CB2 impulses being applied to the particular reset coil.

While there have been shown and described and pointed out the fundamental novel features ofithe invention as applied to a preferred embodiment, it will be understood that various omissions and substitutions andchang'es in the form and details of the'device illustrated and in its op- 'eration 'may be made by those skilled in the art, without departing'from the spirit of the invention. It is'the intention, therefore, to be limited onlyas'indicatedbythe scope of the following claims.

Whatisclaimedis:

liln'an apparatus of the class described, an impulse counter, a group of code relays, means "for entering'aiactor in said relays through the ene'rgization of said relays either singly or in "combination, corre'sponding'contacts for each of said relays andsettable to represent said factor, impulse means, contacting means, a plurality of contactspositions, means for coupling a number of aidp'ositionsto each said contacts where said nur'nberis equal to the coded value of said contests, and means for selectively applying impulses 'from said impulse 'm'eans through said positions to "said impulse'counter as'determined "by said contacts, said impulse counter register- "ing thenu'mber 'oipulse's equal to said factor.

n 2. In an apparatus of "the class described, 'a ractor receivi'ng device comprising a set of four re1ays respectively represe" tative of the digits 4, 2, 2 and 1, means for entering a factor in" said device through the energization of said relays either singly or in combination, an impulse 'counter, pulse means, contact means for each'of "said relays-andsettable for representing said factor,"said pulse means being coupled to said contactmeans, switch means having-a contactor operated tcnbr step t cc s e 9 t p tions. sa d qont c m ans each. Oi Said, relays pbei ssoun edie sa dscqnt t Positions, a o said contact means being coupled to'a number of s doontacts positions equal "to the digit represented bysaid respective contact means, said pulse -means applying pulses to said counter as contac'tor is'advancedjs'tep by"'step as deterfinine'd byfsaid 'contafct' means fs'aid counterweeiving a number of "pulses equal to the factor enteredin said relays. i I s W H i it; try eceivingdevice'comprising a plurality of "contacts "settable singly or in combination to rep resent the digits l to 9, each of s'aidcontacts having a "iriormal" and 'a transferred position where *said contacts"are considered ina "set position *when transferred, contacting means adap'ted'to be operated step by step to successive contacts equal to the digit represented by "said 'co 7 ta s, and means for causing, 'ass'ai'd contacting means is advanced stepby step, the reading out or tlie number as represented by said contacts being'in a transferred position or the complement o'f the number as represented'by, said contacts being in the normal position thereof. H I

h i In an apparatus of the :class casement n entr receiving device comprising a set oi roar relays each having a set of contacts operably ass'o'ciated therewith, said relays being re'spectively representative of, the digits4, 2 menu l rne' ans for entering -a value in saidfrelays through the energizatio'n thereof either singly of incombin o s m sc u e sa c n a t? impulse counter, contacting means adapted to be operated 7 step by step to successive contacts positions, means electrically interconnecting said contacts to a number of said contacts positions equal to the digit represented by the corresponding o ne of said associated relays, means for causing saidcontacting means to be advanced step by step, said advancing contacting means enabling said pulse means to be applied to said he digits 4, 2, 2 and l, discrete pulse means, an

' impulse counter, saidpulse'means being coupled to said contacts, a pluralityof normally open connections, one side of each "of said connections being commonly coupled to said impulsecounter,

the other side of each of said connectionsbe'ing separately connected in groups of-4, 2, 2' and l'to the corresponding one of said contacts, contacting means adapted to be advanced step by step to close said open connections, said advancing contacting means causingsaid pulse means to apply separate impulses to said counter equal in numberto the value set on saidcontacts.

'6. In an apparatus-of thecla'ss' described com"- prising a set'of 'denominationally'order settabl'e "elements eachcoinprising a pluralityoi contacts respectively representative ofthe'digits lfi, 2 and 1 "settable' either'singly'or-in combination torso- =resent a multidenominational"amount, stepping switch meansior each said elementsincluding contactingmeans and a plurality ofsu'ccessive contacts positions'means torcoupling an equivalentnumber of saidcontacts positions torespective ones of said positions'an impulse-counter associated with each said elements, means for advancing said contactingmeans step by step for reading out through said positions the number set in said contacts, and carry'means" coupledto one of said contacts positions for enabling a carry operation to be carried out when said contacting "means is advanced to said one of said positions.

'l. In anapparatus of the class described, a plurality of'contactssettable singly or in-combination to represent the digits 1 to 9, contacting means adapted 'tobe' operated step by step to successive contacts positions, said-contacts p0- sitions being coupled to respective ones" of "said 'settable contacts,'the number of positions "coupled tothe corresponding one of said settable contacts being equal to the digit representation "of 4 saidsettable' contacts, and means for advancing said contacting means step by step for read- 13 ing out through said positions the number entered in said settable contacts.

8. In an apparatus of the class described, a plurality of contacts settable singly or in combination to represent the digits 1 to 9, contacting means adapted to be operated step by step to successive contacts positions, certain of said po- HANS P. LUHN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,099,754 Robinson Nov. 23, 1937 2,206,660 Bryce July 2, 1940 

